Open AccessThe Influence of Downstream Diurnal Heating on the Descent of Flow across the Sierras
Author(s) -
Georg J. Mayr,
Laurence Armi
Publication year - 2010
Publication title -
journal of applied meteorology and climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.079
H-Index - 134
eISSN - 1558-8432
pISSN - 1558-8424
DOI - 10.1175/2010jamc2516.1
Subject(s) - crest , descent (aeronautics) , diurnal cycle , geology , environmental science , air mass (solar energy) , flow (mathematics) , stratified flow , warm front , meteorology , airflow , atmospheric sciences , oceanography , mechanics , geography , turbulence , physics , boundary layer , quantum mechanics , thermodynamics
The potential for a stably stratified air mass upstream of the Sierra Nevada (California) to descend as foehn into the nearly 3-km-deep Owens Valley was studied for the 2 March 2006 case with observations from sondes, weather stations, and two aircraft flights. While upstream conditions remained almost unchanged throughout the day, strong diurnal heating on the downstream side warmed the valley air mass sufficiently to permit flow through the passes to descend to the valley floor only in the late afternoon. Potential temperatures of air crossing the crest were too warm to descend past a virtual floor formed by the strong potential temperature step at the top of the valley air mass, the height of which changed throughout the day primarily due to diurnal heating in the valley. The descending stably stratified flow and its rebound with vertical velocities as high as 8 m s−1 were shaped by the underlying topography and the virtual valley floor.